The answer neither 11 nor 10. It doesn’t make sense at all to get 11 or 10. If you guys read the question carefully, the question said bring “100 bottles” and not “100 EMPTY bottles to the shop”. It did not specify clearly are these bottles empty or full. Thus, the question is irrelevant to solve it and the answer to this question is a secret(unknown).

ans is that we can get 0 drink, as it needs empty bottles ,but not the drinks, you can find the answers in P3 Olympic math. the book clearly mentions that how many new bottles of milks you can get, if you take 100 bottles of milk to the shop. 答案系可以兌換 0 瓶飲品， 因為題目要求是空瓶。而且沒有說他會喝光，所以不能做任何兌換。印象中系小三的奧數， 下學期, 書入門用字比較好， 有說明系100牛奶可以換幾多瓶新牛奶. D 人無聊改題目來trick 人. 令到答案可以兩邊走。你只要答唔同情況下的結果就ok.